Spring Boot 是支持在系统加载的时候配置随机数的
1.添加config/random.properties文件
#随机32位MD5字符串
user.random.secret=${random.value}
#随机int数字
user.random.intNumber=${random.int}
#随机long数字
user.random.longNumber=${random.long}
#随便uuid
user.random.uuid=${random.uuid}
#随机10以内的数字
user.random.lessTen=${random.int(10)}
#随机1024~65536之内的数字
user.random.range=${random.int[1024,65536]}
2.创建类：
mport org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
/**
* 随机数
*/
@Component
@ConfigurationProperties(prefix = "user.random")
@PropertySource(value = { "config/random.properties" })
public class RandomConfig {
private String secret;
private int intNumber;
private int lessTen;
private int range;
private long longNumber;
private String uuid;
public String getSecret() {
return secret;
}
public void setSecret(String secret) {
this.secret = secret;
}
public int getIntNumber() {
return intNumber;
}
public void setIntNumber(int intNumber) {
this.intNumber = intNumber;
}
public int getLessTen() {
return lessTen;
}
public void setLessTen(int lessTen) {
this.lessTen = lessTen;
}
public int getRange() {
return range;
}
public void setRange(int range) {
this.range = range;
}
public long getLongNumber() {
return longNumber;
}
public void setLongNumber(long longNumber) {
this.longNumber = longNumber;
}
public String getUuid() {
return uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
}
具体的生成细节可以参考Spring Boot的配置类：org .springframework .boot .context .config .RandomValuePropertySource
使用了 Java 自带的 java.util.Random 和 java.util.UUID 等工具类
public RandomValuePropertySource(String name) {
super(name, new Random());
}
private Object getRandomValue(String type) {
if (type.equals("int")) {
return getSource().nextInt();
}
if (type.equals("long")) {
return getSource().nextLong();
}
String range = getRange(type, "int");
if (range != null) {
return getNextIntInRange(range);
}
range = getRange(type, "long");
if (range != null) {
return getNextLongInRange(range);
}
if (type.equals("uuid")) {
return UUID.randomUUID().toString();
}
return getRandomBytes();
}
Original: https://www.cnblogs.com/qinxu/p/14201933.html
Author: 【cosmo】
Title: spring boot 配置随机数那些小技
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